Reliability
Both the MPUs and clocks are working in 1:1 redundancy mode. The master and slave MPUs
communicate and monitor each other's status. If the master MPU fails, the slave MPU
automatically takes over packets and becomes the new master MPU, which improves device
reliability.
1.6.3 Signal Flow on the Data Plane
The data plane processes and forwards data packets at a high speed. The signal flow in the
data plane is primarily service data signals.
Signals on the data plane flow through a physical link, an uplink board, an SFU, a downlink
board, and another physical link.
Figure 1-5 illustrates the processing and forwarding of a signal flow on the data plane.
Figure 1-5 Processing and forwarding of a signal flow on the data plane
The processing and forwarding of a signal flow on the different uplink board and downlink board may
differ. For more information, see "Overall QoS Process" in the HUAWEI NetEngine40E Universal
Service Router Feature Description - QoS.
The processing of an incoming signal flow is as follows:
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